Portable screen



FIG. 1 is a fully assembled front view showing the design;

FIG. 2 is a fully assembled back view showing the design with a cover up and over the screen;

FIG. 3 is a fully assembled side right view showing the design;

FIG. 4 is a fully assembled side left view showing the design;

FIG. 5 is a fully assembled top view showing the design;

FIG. 6 is a fully assembled bottom view showing the design;

FIG. 7 is a fully assembled isometric view showing the design, in an alternate view showing the cover stowed; and,

FIG. 8 is a fully assembled isometric view showing the design with the cover up and over the screen.

The broken lines illustrate environmental structure that forms no part of the claimed design for a portable screen. 

CLAIM The ornamental design for a portable screen, as shown and described. 